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| 型號： | ADA4841-X |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit, 8-Channel, 250 kSPS PulSAR㈢ ADC. |
| 中文描述： | 16位，8通道，250 kSPS的PulSAR系列㈢ADC的。 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 2041K |
| 代理商： | ADA4841-X |
16-Bit, 8-Channel,
250 kSPS PulSAR
ADC
Preliminary Technical Data
AD7689
FEATURES
Rev. PrC
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
2007 Analog Devices, Inc. All rights reserved.
www.analog.com
16-bit resolution with no missing codes
8-channel multiplexer with:
Unipolar single ended or
Differential (GND sense)/Bipolar inputs
Throughput: 250 kSPS
INL/DNL: ±0.6 LSB typical
Dynamic range: 93.5 dB
SINAD: 92.5 dB @ 20 kHz
THD: 100 dB @ 20 kHz
Analog input range:
0 V to V
REF
with V
REF
up to VDD
Reference:
Internal selectable 2.5 V/4.096 V or
External buffered (up to 4.096 V)
External (up to VDD)
Internal temperature sensor
Channel sequencer, selectable 1-pole filter, BUSY indicator
No pipeline delay, SAR architecture
Single-supply 2.7V – 5.5 V operation with
1.8 V to 5 V logic interface
Serial interface SPI/QSPI/MICROWIRE/DSP compatible
Power dissipation:
6 mW @ 5 V/100 kSPS
Standby current: 1 nA
20-lead 4 mm × 4 mm LFCSP package
APPLICATIONS
Battery-powered equipment
Medical instruments
Mobile communications
Personal digital assitants
Data acquisition
Seismic data acquisition systems
Instrumentation
Process Control
FUNCTIONAL BLOCK DIAGRAM
AD7689
REF
GND
VDD
VIO
DIN
SCK
SDO
CNV
1.8V to
VDD
2.7V to 5V
Sequencer
SPI Serial
Interface
MUX
16-Bit SAR
ADC
Band Gap
REF
Temp
Sensor
REFIN
IN0
IN1
IN2
IN4
IN5
IN6
IN7
IN3
COM
0.5V to VDD
22
μ
F
1-Pole
LPF
0.5V to 4.096V
0.1
μ
F
Figure 1.
Table 1. Multichannel14-/16-Bit PulSAR ADC
Type
14-Bit
16-Bit
16-Bit
GENERAL DESCRIPTION
The AD7689 is an 8-channel 16-bit, charge redistribution
successive approximation register (SAR), analog-to-digital
converter (ADC) that operates from a single power supply, VDD.
The AD7689 contains all of the components for use in a multi-
channel, low power, data acquisition system including: a true 16-
bit SAR ADC with no missing codes; an 8-channel, low crosstalk
multiplexer useful for configuring the inputs as single ended (with
or without ground sense), differential or bipolar; an internal low
drift reference (selectable 2.5V or 4.096V) and buffer; a
temperature sensor; a selectable 1-pole filter; and a sequencer
useful when channels are continuously scanned in order.
The AD7689 uses a simple SPI interface for writing to the
configuration register and receiving conversion results. The SPI
interface uses a separate supply, VIO, which is set to the host logic
level.
Power dissipation scales with throughput.
The AD7689 is housed in a tiny 20-lead LFCSP with operation
specified from 40°C to +85°C.
Channels
8
4
8
250
kSPS
AD7949
AD7682
AD7689
500
kSPS
AD7699
ADC
Driver
ADA4841-x
ADA4841-x
ADA4841-x
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